CN115978730A - Controller for cold station system, and frequency conversion control method and system for cooling tower - Google Patents
Controller for cold station system, and frequency conversion control method and system for cooling tower Download PDFInfo
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- CN115978730A CN115978730A CN202211618637.8A CN202211618637A CN115978730A CN 115978730 A CN115978730 A CN 115978730A CN 202211618637 A CN202211618637 A CN 202211618637A CN 115978730 A CN115978730 A CN 115978730A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application provides a controller for a cold station system, a frequency conversion control method of a cooling tower and a system. And in the process that the controller adjusts the frequency of each frequency converter in the at least one frequency converter, the controller is used for obtaining a target cooling parameter threshold value of the cooling tower according to the outdoor wet bulb temperature of the cooling tower and the load rate of each water chilling unit in the at least one water chilling unit. Further, the controller is used for obtaining a first cooling parameter of the cooling tower, and adjusting the frequency of the frequency converter corresponding to the cooling tower according to a comparison result of the first cooling parameter and a target cooling parameter threshold value, so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold value. Based on the application, the cold station system can run in an energy-saving state under different outdoor weather and different load rates, and the system power consumption is greatly reduced.
Description
Technical Field
The application relates to the field of air conditioner control, in particular to a frequency conversion control method and system for a controller and a cooling tower of a cold station system.
Background
At present, in a cold station system, the frequency of a frequency converter is adjusted according to a comparison result between the outlet water temperature or the approximation degree of a cooling tower and a fixed set value, so as to realize the frequency conversion control of the cooling tower by the frequency converter. However, in outdoor weather or when the load of the chiller unit changes, the fixed set value is still adopted to be compared with the outlet water temperature or the approximation degree, so that the cold station system operates in a state of no energy saving, and the power consumption of the system is too high.
Disclosure of Invention
The application provides a controller for a cold station system, a frequency conversion control method and a frequency conversion control system for a cooling tower, which can enable the cold station system to operate in an energy-saving state under different outdoor weathers and different load rates, and greatly reduce the power consumption of the system.
In a first aspect, the present application provides a controller for a cold station system including at least one cooling tower, at least one chiller, and at least one inverter corresponding to the at least one cooling tower.
In the process that the controller adjusts the frequency of each frequency converter in the at least one frequency converter, the controller is used for obtaining a target cooling parameter threshold value of the cooling tower according to the outdoor wet bulb temperature of the cooling tower and the load factor of each water chilling unit in the at least one water chilling unit, wherein the target cooling parameter threshold value comprises an effluent water temperature threshold value or an approximation degree threshold value. It can be understood that the controller can obtain different target cooling parameter thresholds according to different outdoor wet bulb temperatures and different load rates of the water chilling units, that is, the specific numerical value of the target cooling parameter threshold can be dynamically adjusted according to the outdoor wet bulb temperatures and the load rates of the water chilling units, so that the real-time performance and the accuracy of the target cooling parameter threshold are improved, and the applicability is strong.
Further, the controller is used for obtaining a first cooling parameter of the cooling tower and adjusting the frequency of the frequency converter corresponding to the cooling tower according to a comparison result of the first cooling parameter and a target cooling parameter threshold value, so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold value. The second cooling parameter is a cooling parameter obtained after the frequency is adjusted, and the first cooling parameter or the second cooling parameter comprises the water outlet temperature or the approximation degree. It can be understood that the controller can dynamically adjust the frequency of the frequency converter corresponding to the cooling tower according to the comparison result of the first cooling parameter and the target cooling parameter threshold value, so that the heat exchange capacity of at least one cooling tower is fully utilized, the water inlet temperature of cooling water generated by at least one water chilling unit is reduced, the energy consumption of at least one cooling tower cannot be excessively increased, a cold station system can operate in an energy-saving state under different outdoor weathers and different load rates, and the system power consumption is greatly reduced.
With reference to the first aspect, in a first possible implementation manner, the controller is configured to obtain an initial cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature and the load factor of each water chiller, and obtain a plurality of cooling parameter thresholds according to the initial cooling parameter threshold. The controller is used for obtaining a plurality of total powers of the cooling tower and the water chilling units under a plurality of cooling parameter thresholds. Wherein one of the plurality of cooling parameter thresholds corresponds to one of a plurality of total powers, the total power including an input power of the cooling tower and an input power of each chiller. Further, the controller is configured to use a cooling parameter threshold corresponding to a minimum total power of the plurality of total powers as a target cooling parameter threshold.
It can be understood that the controller can dynamically adjust the specific numerical value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load rate of each water chilling unit, so that the real-time performance and the accuracy of the target cooling parameter threshold are improved, a cold station system can operate in an energy-saving state under different outdoor weather conditions and different load rates, and the power consumption of the system is greatly reduced.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the controller is configured to increase the target cooling parameter threshold value under the condition that the outdoor wet bulb temperature is not changed and the load rate of each water chilling unit is in an ascending trend. It can be understood that, under the condition that the target cooling parameter threshold is determined and the load rate of each water chilling unit is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the controller is configured to lower the target cooling parameter threshold value when the outdoor wet bulb temperature is in an ascending trend and the load factor of each chiller is not changed. It can be understood that, under the condition that the target cooling parameter threshold is determined and the outdoor wet bulb temperature is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
With reference to any one of the first to the third possible implementation manners of the first aspect, in a fourth possible implementation manner, the load factor may be determined by at least one parameter of a cooling capacity, a cooling percentage, an input power, a power percentage, an electric current, and an electric current percentage of the chiller.
In a second aspect, the application provides a frequency conversion control method for a cooling tower, which is applicable to a cold station system, wherein the cold station system comprises at least one cooling tower, at least one water chilling unit and a frequency converter corresponding to the at least one cooling tower. The method may be performed by a controller internal or external to the cold station system. In the method, a controller obtains an outdoor wet bulb temperature of the cooling tower and a load factor of each of at least one chiller. The controller can obtain a target cooling parameter threshold value of the cooling tower according to the outdoor wet bulb temperature and the load rate of each water chilling unit, wherein the target cooling parameter threshold value comprises an outlet water temperature threshold value or an approximation degree threshold value. It can be understood that the controller can obtain different target cooling parameter thresholds according to different outdoor wet bulb temperatures and different load rates of the water chilling units, that is, the specific numerical value of the target cooling parameter threshold can be dynamically adjusted according to the outdoor wet bulb temperatures and the load rates of the water chilling units, so that the real-time performance and the accuracy of the target cooling parameter threshold are improved, and the applicability is strong.
Further, the controller may obtain a first cooling parameter of the cooling tower, and adjust a frequency of the frequency converter corresponding to the cooling tower according to a comparison result of the first cooling parameter and a target cooling parameter threshold, so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold. The first cooling parameter or the second cooling parameter comprises water outlet temperature or approximation degree, and the second cooling parameter is obtained after the frequency is adjusted. It can be understood that the controller can dynamically adjust the frequency of the frequency converter corresponding to the cooling tower according to the comparison result of the first cooling parameter and the target cooling parameter threshold value, so that the heat exchange capacity of at least one cooling tower is fully utilized, the water inlet temperature of cooling water generated by at least one water chilling unit is reduced, the energy consumption of at least one cooling tower cannot be excessively increased, a cold station system can operate in an energy-saving state under different outdoor weather and different load rates, and the system power consumption is greatly reduced.
In combination with the second aspect, in a first possible implementation manner, the controller may obtain an initial cooling parameter threshold value of the cooling tower according to the outdoor wet bulb temperature and the load factor of each water chilling unit, and obtain a plurality of cooling parameter threshold values according to the initial cooling parameter threshold value. The controller may obtain a plurality of total powers of the cooling tower and the chiller units under a plurality of cooling parameter thresholds, wherein one of the plurality of cooling parameter thresholds corresponds to one of the plurality of total powers, and the total power includes an input power of the cooling tower and an input power of each chiller unit. Further, the controller may use a cooling parameter threshold corresponding to a minimum total power of the plurality of total powers as a target cooling parameter threshold for the cooling tower.
It can be understood that the controller can dynamically adjust the specific numerical value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load rate of each water chilling unit, so that the real-time performance and the accuracy of the target cooling parameter threshold are improved, a cold station system can operate in an energy-saving state under different outdoor weather conditions and different load rates, and the power consumption of the system is greatly reduced.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the controller may increase the target cooling parameter threshold value under the condition that the outdoor wet bulb temperature is not changed and the load rate of each water chilling unit is in an ascending trend. It can be understood that, under the condition that the target cooling parameter threshold is determined and the load rate of each water chilling unit is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
In a third possible implementation manner, in combination with the first possible implementation manner of the second aspect, the controller may lower the target cooling parameter threshold value when the outdoor wet bulb temperature is in an ascending trend and the load factor of each chiller is not changed. It can be understood that, under the condition that the target cooling parameter threshold is determined and the outdoor wet bulb temperature is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
In a third aspect, the present application provides a cold station system including at least one cooling tower, at least one chiller, at least one inverter corresponding to the at least one cooling tower, and a controller as provided in any one of the fourth possible embodiments of the first to the first aspects. The controller is used for adjusting the frequency of each frequency converter in the at least one frequency converter. And each frequency converter is used for operating according to the frequency of each frequency converter so as to carry out frequency conversion control on the cooling tower corresponding to each frequency converter. The at least one cooling tower is used for dissipating heat of the at least one water chilling unit.
With reference to the third aspect, in a first possible embodiment, the cold station system further comprises at least one cooling water pump. The at least one cooling water pump is used for conveying cooling water generated by the at least one water chilling unit to the at least one cooling tower, so that the at least one cooling tower dissipates heat of the at least one water chilling unit.
In a fourth aspect, the present application provides an air conditioning system comprising an air conditioner, at least one chilled water pump, and a cold station system as provided in any one of the first possible embodiments of the third to third aspects. Wherein, at least one chilled water pump is used for delivering the chilled water that at least one cooling water set produced to the air conditioner.
In the application, the controller can dynamically adjust the specific numerical value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load rate of each water chilling unit, so that the cold station system can operate in an energy-saving state under different outdoor weathers and different load rates, and the power consumption of the system is greatly reduced.
Drawings
Fig. 1 is a schematic view of an application scenario of a cold station system provided in the present application;
FIG. 2 is a schematic block diagram of a cold station system provided herein;
fig. 3 is a schematic flow chart of a variable frequency control method of a cooling tower provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following describes embodiments of the present application in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of a cold station system provided in the present application. As shown in fig. 1, the air conditioning system 1 includes an air conditioner 10, chilled water pumps 20a to 20y, and a cold station system 30. The cold station system 30 includes water chilling units 301a to 301m.
The water chiller units 301a to 301m are core devices in the air conditioning system 1, and are configured to generate chilled water on the evaporator side and supply the air conditioner 10 with cooling by a vapor compression refrigeration cycle, while generating heat on the condenser side and dissipating the heat in the outdoor air by a cooling tower inside the cold station system 30. The chiller may also be referred to as a water-cooled chiller.
The chilled water pumps 20a to 20y are used to supply chilled water generated by the water chiller units 301a to 301m to the air conditioner 10, so that the air conditioner 10 performs cooling.
In one embodiment, the chilled water pumps 20a through 20y are connected in parallel with each other. The number of the chilled water pumps 20a to 20y is determined by the circulating water amount of the chilled water generated by the chiller 301a to 301m, and is not particularly limited.
The structure and operation of the cold station system 30 will be described in detail below.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a cold station system provided in the present application. As shown in fig. 2, the cold station system 30 includes cooling towers 300a to 300n, chiller units 301a to 301m, frequency converters 302a to 302n corresponding to the cooling towers 300a to 300n, and a controller 303.
The controller 303 is configured to adjust the frequency of each of the frequency converters 302a to 302n.
And each frequency converter is used for operating according to the frequency of each frequency converter so as to carry out frequency conversion control on the cooling tower corresponding to each frequency converter.
The cooling towers 300a to 300n are used for radiating heat from the water chiller 301a to the water chiller 301m.
In one embodiment, the controller 303 may be disposed internal to the cold station system 30. In another embodiment, the controller 303 may also be located external to the cold station system 30, the controller 303 including, but not limited to, a building controller or a controller within a cold cluster control system. The building controller is a controller for centralized management and monitoring of various electromechanical devices in the building, including the cold station system 30. The chiller group control system is a system for automatically controlling the cooling towers 300a to 300n, the water chilling units 301a to 301m, the frequency converters 302a to 302n and the cooling water pumps 304a to 304x so as to realize the effects of energy conservation, accurate control, convenient operation and maintenance and the like.
In one embodiment, solid lines between the controller 303 and the frequency converters 302a to 302n are used to indicate that the controller 303 establishes a wired or wireless connection with the frequency converters 302a to 302n to adjust the frequency of each of the frequency converters 302a to 302n.
In one embodiment, as shown in FIG. 2, one of the cooling towers 300 a-300 n corresponds to one of the inverters 302 a-302 n. Specifically, the cooling tower 300a corresponds to the frequency converter 302a, the cooling tower 300b corresponds to the frequency converter 302b, the cooling tower 300c corresponds to the frequency converter 302c, \ ..., and the cooling tower 300n corresponds to the frequency converter 302n.
In one embodiment, at least two of the cooling towers 300 a-300 n correspond to the same one of the inverters 302 a-302 n.
In one embodiment, as shown in fig. 2, each of the cooling towers 300a to 300n includes a blower therein, and the blower is used for drawing hot air, which has undergone heat exchange in the cooling tower, from the top and guiding low-temperature air to enter from the inlet air at the bottom of the cooling tower, so as to achieve the purpose of dissipating heat from the water chilling units 301a to 301m. Specifically, cooling tower 300a includes fan a, cooling tower 300b includes fan b, cooling tower 300c includes fan c, 8230, and cooling tower 300n includes fan n.
In an embodiment, each of the frequency converters 302a to 302n may be connected to a fan in the cooling tower corresponding to each frequency converter, and is used to control the rotation speed of the fan in the cooling tower corresponding to each frequency converter, so as to implement frequency conversion control on the cooling tower corresponding to each frequency converter. It can be understood that the frequency of each frequency converter can determine the rotating speed of the fan in the cooling tower corresponding to each frequency converter. Taking the inverter 302a as an example to perform the inverter control on the cooling tower 300a, when the frequency of the inverter 302a is reduced, the rotation speed of the fan a is also reduced to weaken the heat exchange effect of the cooling tower 300 a; alternatively, in case the frequency of the frequency converter 302a is increased, the rotation speed of the fan a is also increased to enhance the heat exchange effect of the cooling tower 300 a.
It can be understood that, for a specific implementation manner of performing frequency conversion control on the cooling tower corresponding to the frequency converter 302a through the frequency converter 302n by other frequency converters, reference may be made to the specific implementation manner of performing frequency conversion control on the cooling tower 300a by the frequency converter 302a, and details are not described herein again.
In one embodiment, the cooling towers 300a to 300n refer to devices that radiate heat from the water chilling units 301a to 301m in the cold station system 30 or the air conditioning system 1. The cooling towers 300a to 300n are used for performing total heat exchange by contacting cooling water generated by the cold water units 301a to 301m with air, thereby achieving the purpose of dissipating heat from the cold water units 301a to 301m.
In one embodiment, as shown in FIG. 2, the cold station system 30 further includes cooling water pumps 304a through 304x. The cooling water pumps 304a to 304x are used for delivering cooling water generated by the water chilling units 301a to 301m to the cooling towers 300a to 300n, so that the cooling towers 300a to 300n dissipate heat of the water chilling units 301a to 301m.
In one embodiment, the cooling water pumps 304a to 304x are used to supply the cooling water generated by the chiller units 301a to 301m to the cooling towers 300a to 300n through pipes, and the cooling towers 300a to 300n are used to supply the cooling water to the chiller units 301a to 301m through pipes, so as to realize the cooling water circulation process of the cold station system 30.
In one embodiment, cooling water pumps 304a through 304x are connected in parallel with each other. The number of the cooling water pumps 304a to 304x is determined by the circulating water amount of the cooling water generated by the water chiller 301a to 301m, and is not particularly limited.
A specific process of the controller 303 adjusting the frequency of each frequency converter will be described below.
In one embodiment, the controller 303 is configured to obtain the target cooling parameter threshold of the cooling tower according to an outdoor wet bulb temperature of the cooling tower and a load factor of each of the chiller units 301a to 301m. Wherein the target cooling parameter threshold comprises an effluent temperature threshold or an approximation threshold. It can be understood that the controller 303 may obtain different target cooling parameter thresholds according to different outdoor wet bulb temperatures and different load rates of the water chilling units, that is, the specific value of the target cooling parameter threshold may be dynamically adjusted according to the outdoor wet bulb temperatures and the load rates of the water chilling units, so as to improve the real-time performance and accuracy of the target cooling parameter threshold, and the applicability is strong.
Further, the controller 303 is configured to obtain a first cooling parameter of the cooling tower, and adjust a frequency of the frequency converter corresponding to the cooling tower according to a comparison result between the first cooling parameter and a target cooling parameter threshold, so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold. The first cooling parameter or the second cooling parameter comprises water outlet temperature or approximation degree, and the second cooling parameter is obtained after the frequency is adjusted. The approximation degree is the difference between the outlet water temperature and the outdoor wet bulb temperature.
It can be understood that the controller 303 may dynamically adjust the frequency of the frequency converter corresponding to the cooling tower according to the comparison result between the first cooling parameter and the target cooling parameter threshold, so as to fully utilize the heat exchange capability of the cooling towers 300a to 300n, reduce the water inlet temperature of the cooling water generated by the water chilling units 301a to 301m, and at the same time, not excessively increase the energy consumption of the cooling towers 300a to 300n, so that the cold station system 30 can operate in an energy saving state under different outdoor weathers and different load ratios, thereby greatly reducing the system power consumption.
In the present embodiment, the cooling tower refers to any one of the cooling towers 300a to 300n, and is not particularly limited herein. The first cooling parameter and the second cooling parameter may be understood as current cooling parameters of the cooling tower acquired by the controller 303 at different points in time.
In one embodiment, in fig. 2, the dashed line between the controller 303 and the cooling towers 300a to 300n is used to indicate that the controller 303 obtains the first cooling parameter or the second cooling parameter of any one of the cooling towers 300a to 300 n. The dotted lines between the controller 303 and the chiller units 301a to 301m are used to indicate that the controller 303 obtains the load rates of the chiller units 301a to 301m.
In one embodiment, where the cold station system 30 further includes a temperature sensing device, the temperature sensing device is used to collect the outdoor wet bulb temperature in real time and send the outdoor wet bulb temperature to the controller 303. The controller 303 is configured to receive the outdoor wet bulb temperature. Or, the temperature detection device is used for acquiring the outdoor dry bulb temperature and the dew point temperature of the cooling tower in real time, and sending the outdoor dry bulb temperature and the dew point temperature to the controller 303. The controller 303 is configured to calculate the outdoor dry-bulb temperature and the dew-point temperature based on the formula to obtain the outdoor wet-bulb temperature.
In one embodiment, in the case that the cold station system 30 further includes a temperature detection device and a humidity detection device, the temperature detection device is used for collecting the outdoor dry bulb temperature of the cooling tower in real time and sending the outdoor dry bulb temperature to the controller 303. The humidity detection device is used for acquiring the relative humidity of the cooling tower in real time and sending the relative humidity to the controller 303. The controller 303 is configured to calculate the outdoor dry-bulb temperature and the relative humidity based on a formula to obtain the outdoor wet-bulb temperature.
In one embodiment, the load rate is determined by at least one of the cooling capacity, percentage of cooling, input power, percentage of power, current, and percentage of current of the chiller. The controller 303 is configured to use any one parameter of the refrigeration capacity, the refrigeration percentage, the input power, the power percentage, the current, and the current percentage of each water chilling unit as the load factor of each water chilling unit. Alternatively, the controller 303 is configured to calculate at least one parameter of the cooling capacity, the cooling percentage, the input power, the power percentage, the current and the current percentage of each water chilling unit based on a formula to obtain the load factor of each water chilling unit. The specific parameter of the at least one parameter may be determined by a formula, and in the case of adopting different formulas, the specific parameter of the at least one parameter may also be different, and the specific parameter of the at least one parameter is not limited herein.
In one embodiment, the other controllers are configured to calculate at least one parameter of the cooling capacity, the cooling percentage, the input power, the power percentage, the current and the current percentage of each water chilling unit based on a formula to obtain a load rate of each water chilling unit, and send the load rate of each water chilling unit to the controller 303. Other controllers include, but are not limited to, building controllers or controllers within a chiller control system. The controller 303 is configured to receive load rates of the chiller units.
In one embodiment, the controller 303 is configured to obtain an initial cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature and the load factor of each chiller, and obtain a plurality of cooling parameter thresholds according to the initial cooling parameter threshold. In specific implementation, the controller 303 is configured to calculate the outdoor wet bulb temperature and the load rate of each water chilling unit based on a formula to obtain the initial cooling parameter threshold, or perform table lookup according to the outdoor wet bulb temperature and the load rate of each water chilling unit to obtain the initial cooling parameter threshold. The plurality of cooling parameter thresholds are greater than or equal to a difference between the initial cooling parameter threshold and a bias value, which may be a user-set parameter or a factory configuration parameter of the cooling tower, and less than or equal to a sum of the initial cooling parameter threshold and the bias value.
The controller 303 is configured to obtain a plurality of total powers of the cooling tower and each chiller at a plurality of cooling parameter thresholds. The cooling parameter threshold value in the plurality of cooling parameter threshold values corresponds to one total power in the plurality of total powers, and the total power comprises the input power of the cooling tower and the input power of each water chilling unit, namely the total power is the sum of the input power of the cooling tower and the input power of each water chilling unit. In a specific implementation, the controller 303 acquires a plurality of total powers of the cooling tower and the water chilling units under a plurality of cooling parameter thresholds through the power detection device. Or, the controller 303 calculates the frequency of the frequency converter corresponding to the cooling tower based on a formula to obtain the input power of the cooling tower, calculates the current percentage of each water chilling unit based on a formula to obtain the input power of each water chilling unit, and sums the input power of the cooling tower and the input power of each water chilling unit to obtain the total power.
The controller 303 is configured to use the cooling parameter threshold corresponding to the minimum total power of the plurality of total powers as the target cooling parameter threshold. It can be understood that the controller 303 can dynamically adjust the specific value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load factor of each chiller, thereby improving the real-time performance and accuracy of the target cooling parameter threshold, and enabling the cold station system 30 to operate in an energy-saving state under different outdoor weather conditions and different load factors, thereby greatly reducing the system power consumption.
In one embodiment, the controller 303 may also use the initial cooling parameter threshold as the target cooling parameter threshold of the cooling tower, and the calculation process is simpler.
In one embodiment, the controller 303 is configured to increase the target cooling parameter threshold if the outdoor wet bulb temperature is not changed and the load factor of each chiller is in an increasing trend. It can be understood that, when the target cooling parameter threshold is determined and the load rate of each water chilling unit changes, the controller 303 may readjust the target cooling parameter threshold, so as to further improve the real-time performance and accuracy of the target cooling parameter threshold, and the applicability is strong.
In one embodiment, the controller 303 is configured to lower the target cooling parameter threshold if the outdoor wet bulb temperature is in an upward trend and the load factor of each chiller is not changed. It can be understood that, in the case that the target cooling parameter threshold is determined and the outdoor wet bulb temperature changes, the controller 303 may further readjust the target cooling parameter threshold, so as to further improve the real-time performance and accuracy of the target cooling parameter threshold, and the applicability is strong.
In one embodiment, the target cooling parameter threshold is in an upward trend with the outdoor wet bulb temperature in a downward trend and the load rate of each chiller in an upward trend. And under the condition that the outdoor wet bulb temperature is in an ascending trend and the load rate of each water chilling unit is in a descending trend, the target cooling parameter threshold value is in a descending trend.
In an embodiment, after obtaining the target cooling parameter threshold, the controller 303 is configured to obtain a first cooling parameter of the cooling tower, and if the first cooling parameter is smaller than the target cooling parameter threshold, lower a frequency of an inverter corresponding to the cooling tower so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold, so that the cooling station system 30 is operated in an energy saving state as a whole, and power consumption of the system is greatly reduced. The controller 303 is further configured to increase the frequency of the frequency converter corresponding to the cooling tower when the first cooling parameter is greater than the target cooling parameter threshold, so that the second cooling parameter of the cooling tower reaches the target cooling parameter threshold, thereby enabling the cooling station system 30 to operate in an energy-saving state as a whole, and greatly reducing the power consumption of the system.
In an embodiment, when the target cooling parameter threshold is the outlet water temperature threshold and the first cooling parameter is the first outlet water temperature, the controller 303 is configured to decrease the frequency of the frequency converter corresponding to the cooling tower if the first outlet water temperature is less than the outlet water temperature threshold, or increase the frequency of the frequency converter corresponding to the cooling tower if the first outlet water temperature is less than the outlet water temperature threshold, so that the second outlet water temperature of the cooling tower reaches the outlet water temperature threshold, thereby the cooling station system 30 is operated in an energy saving state as a whole, and the system power consumption is greatly reduced.
In an embodiment, when the target cooling parameter threshold is an approximation threshold and the first cooling parameter is a first approximation, the controller 303 is configured to decrease the frequency of the frequency converter corresponding to the cooling tower if the first approximation is smaller than the approximation threshold, or increase the frequency of the frequency converter corresponding to the cooling tower if the first approximation is smaller than the approximation threshold, so that the second approximation of the cooling tower reaches the approximation threshold, so that the cooling plant system 30 is operated in an energy saving state as a whole, and the system power consumption is greatly reduced.
In the cold station system 30 provided in this embodiment, the controller 303 is configured to dynamically adjust the specific value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load factor of each chiller, so that the cold station system 30 can operate in an energy-saving state under different outdoor weather conditions and different load factors, and the power consumption of the system is greatly reduced.
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for controlling a frequency conversion of a cooling tower provided by the present application. The method is suitable for a cold station system, and the cold station system comprises at least one cooling tower, at least one water chilling unit and a frequency converter corresponding to the at least one cooling tower. The method may be performed by a controller inside or outside the cold station system, including the following steps S101 to S103.
And S101, acquiring the outdoor wet bulb temperature of the cooling tower and the load rate of each water chilling unit in at least one water chilling unit by the controller.
In one embodiment, the controller directly obtains the outdoor wet bulb temperature. Alternatively, the controller obtains an outdoor dry bulb temperature and a dew point temperature of the cooling tower, and calculates the outdoor dry bulb temperature and the dew point temperature based on a formula to obtain an outdoor wet bulb temperature. Alternatively, the controller obtains the outdoor dry bulb temperature and the relative humidity of the cooling tower, and calculates the outdoor dry bulb temperature and the relative humidity based on a formula to obtain the outdoor wet bulb temperature.
In one embodiment, the controller may use any one of the refrigeration capacity, the refrigeration percentage, the input power, the power percentage, the current and the current percentage of each chiller as the load rate of each chiller. Or the controller calculates at least one parameter of the refrigerating capacity, the refrigerating percentage, the input power, the power percentage, the current and the current percentage of each water chilling unit based on a formula so as to obtain the load rate of each water chilling unit. The specific parameter of the at least one parameter may be determined by a formula, and in the case of adopting different formulas, the specific parameter of the at least one parameter may also be different, and the specific parameter of the at least one parameter is not limited herein.
And S102, the controller obtains a target cooling parameter threshold value of the cooling tower according to the outdoor wet bulb temperature and the load rate of each water chilling unit.
In one embodiment, the controller may obtain an initial cooling parameter threshold for the cooling tower based on the outdoor wet bulb temperature and the load factor of each chiller, and obtain a plurality of cooling parameter thresholds based on the initial cooling parameter threshold. In specific implementation, the controller calculates the outdoor wet bulb temperature and the load rate of each water chilling unit based on a formula to obtain the initial cooling parameter threshold, or performs table lookup according to the outdoor wet bulb temperature and the load rate of each water chilling unit to obtain the initial cooling parameter threshold. The plurality of cooling parameter thresholds are greater than or equal to a difference between the initial cooling parameter threshold and a bias value, which may be a user-set parameter or a factory configuration parameter of the cooling tower, and less than or equal to a sum of the initial cooling parameter threshold and the bias value.
The controller may obtain a plurality of total powers of the cooling tower and each chiller at a plurality of cooling parameter thresholds. The cooling parameter threshold value in the plurality of cooling parameter threshold values corresponds to one total power in the plurality of total powers, and the total power comprises the input power of the cooling tower and the input power of each water chilling unit, namely the total power is the sum of the input power of the cooling tower and the input power of each water chilling unit. In the concrete implementation, the controller collects a plurality of total powers of the cooling tower and the water chilling units under a plurality of cooling parameter thresholds through the power detection device. Or the controller calculates the frequency of the frequency converter corresponding to the cooling tower based on a formula to obtain the input power of the cooling tower, calculates the current percentage of each water chilling unit based on the formula to obtain the input power of each water chilling unit, and sums the input power of the cooling tower and the input power of each water chilling unit to obtain the total power.
The controller may use a cooling parameter threshold corresponding to a minimum total power of the plurality of total powers as a target cooling parameter threshold for the cooling tower. It can be understood that the controller can dynamically adjust the specific numerical value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load rate of each water chilling unit, so that the real-time performance and the accuracy of the target cooling parameter threshold are improved, the cold station system can operate in an energy-saving state under different outdoor weather conditions and different load rates, and the power consumption of the system is greatly reduced.
In one embodiment, the controller may increase the target cooling parameter threshold if the outdoor wet bulb temperature is constant and the load rate of each chiller is on an increasing trend. It can be understood that, under the condition that the target cooling parameter threshold is determined and the load rate of each water chilling unit is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
In one embodiment, the controller may lower the target cooling parameter threshold if the outdoor wet bulb temperature is in an upward trend and the load rate of each chiller is not changed. It can be understood that, under the condition that the target cooling parameter threshold is determined and the outdoor wet bulb temperature is changed, the controller can also readjust the target cooling parameter threshold, so that the real-time performance and the accuracy of the target cooling parameter threshold are further improved, and the applicability is strong.
And S103, the controller acquires the current cooling parameter of the cooling tower, and adjusts the frequency of the frequency converter corresponding to the cooling tower according to the comparison result of the current cooling parameter and the target cooling parameter threshold value, so that the second cooling parameter of the cooling tower reaches the target cooling parameter threshold value.
In one embodiment, the first cooling parameter or the second cooling parameter includes a water outlet temperature or an approximation degree, and the second cooling parameter may be a cooling parameter obtained after the frequency is adjusted. The first cooling parameter and the second cooling parameter may be understood as current cooling parameters of the cooling tower acquired by the controller at different points in time.
In an embodiment, after the target cooling parameter threshold is obtained, the controller may obtain a first cooling parameter of the cooling tower, and if the first cooling parameter is smaller than the target cooling parameter threshold, the frequency of the frequency converter corresponding to the cooling tower is reduced, so that a second cooling parameter of the cooling tower reaches the target cooling parameter threshold, thereby enabling the cooling station system to operate in an energy-saving state as a whole, and greatly reducing power consumption of the system.
In one embodiment, the controller may increase the frequency of the frequency converter corresponding to the cooling tower when the first cooling parameter is greater than the target cooling parameter threshold value, so that the second cooling parameter of the cooling tower reaches the target cooling parameter threshold value, thereby enabling the cooling station system to operate in an energy-saving state as a whole, and greatly reducing the power consumption of the system.
In a specific implementation, more operations executed by the controller in the frequency conversion control method for a cooling tower provided by the present application may refer to the implementation manner executed by the controller 303 in the cold station system 30 and the working principle thereof shown in fig. 2, and are not described herein again.
In the method provided by the embodiment, the controller can dynamically adjust the specific numerical value of the target cooling parameter threshold according to the outdoor wet bulb temperature and the load rate of each water chilling unit, so that the cold station system can operate in an energy-saving state under different outdoor weathers and different load rates, and the power consumption of the system is greatly reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A controller for a cold station system, the cold station system comprising at least one cooling tower, at least one chiller, and at least one inverter corresponding to the at least one cooling tower;
the controller is configured to:
obtaining a target cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature of the cooling tower and the load rate of each water chilling unit in the at least one water chilling unit, wherein the target cooling parameter threshold comprises an outlet water temperature threshold or an approximation degree threshold;
and acquiring a first cooling parameter of the cooling tower, and adjusting the frequency of a frequency converter corresponding to the cooling tower according to a comparison result of the first cooling parameter and the target cooling parameter threshold value so as to enable a second cooling parameter of the cooling tower to reach the target cooling parameter threshold value, wherein the second cooling parameter is the cooling parameter acquired after the frequency is adjusted.
2. The controller of claim 1, wherein the controller is configured to:
obtaining an initial cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature and the load rate of each water chilling unit, and obtaining a plurality of cooling parameter thresholds according to the initial cooling parameter threshold;
acquiring a plurality of total powers of the cooling tower and the water chilling units under the plurality of cooling parameter thresholds, wherein one cooling parameter threshold in the plurality of cooling parameter thresholds corresponds to one total power in the plurality of total powers, and the total power comprises the input power of the cooling tower and the input power of each water chilling unit;
and taking the cooling parameter threshold corresponding to the minimum total power in the plurality of total powers as the target cooling parameter threshold.
3. The controller of claim 2, wherein the controller is configured to:
and under the condition that the outdoor wet bulb temperature is unchanged and the load rate of each water chilling unit is in an ascending trend, increasing the target cooling parameter threshold.
4. The controller of claim 2, wherein the controller is configured to:
and under the condition that the outdoor wet bulb temperature is in an ascending trend and the load rate of each water chilling unit is not changed, the target cooling parameter threshold value is reduced.
5. The controller of any one of claims 1-4, wherein the load rate is determined by at least one of a cooling capacity, a cooling percentage, an input power, a power percentage, a current, and a current percentage of the chiller.
6. The method is suitable for a cold station system, wherein the cold station system comprises at least one cooling tower, at least one water chilling unit and an inverter corresponding to the at least one cooling tower;
the method comprises the following steps:
acquiring the outdoor wet bulb temperature of the cooling tower and the load rate of each water chilling unit in the at least one water chilling unit;
obtaining a target cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature and the load rate of each water chilling unit, wherein the target cooling parameter threshold comprises an outlet water temperature threshold or an approximation degree threshold;
and acquiring a first cooling parameter of the cooling tower, and adjusting the frequency of a frequency converter corresponding to the cooling tower according to a comparison result of the first cooling parameter and the target cooling parameter threshold value so as to enable a second cooling parameter of the cooling tower to reach the target cooling parameter threshold value, wherein the second cooling parameter is the cooling parameter acquired after the frequency is adjusted.
7. The method of claim 6, wherein said obtaining a target cooling parameter threshold for the cooling tower based on the outdoor wet bulb temperature and the load factor of each chiller comprises:
obtaining an initial cooling parameter threshold of the cooling tower according to the outdoor wet bulb temperature and the load rate of each water chilling unit, and obtaining a plurality of cooling parameter thresholds according to the initial cooling parameter threshold;
acquiring a plurality of total powers of the cooling tower and the water chilling units under the plurality of cooling parameter thresholds, wherein one cooling parameter threshold in the plurality of cooling parameter thresholds corresponds to one total power in the plurality of total powers, and the total power comprises the input power of the cooling tower and the input power of each water chilling unit;
and taking the cooling parameter threshold corresponding to the minimum total power in the plurality of total powers as a target cooling parameter threshold of the cooling tower.
8. The method of claim 7, further comprising:
and under the condition that the outdoor wet bulb temperature is unchanged and the load rate of each water chilling unit is in an ascending trend, increasing the target cooling parameter threshold.
9. The method of claim 7, further comprising:
and under the condition that the outdoor wet bulb temperature is in an ascending trend and the load rate of each water chilling unit is not changed, the target cooling parameter threshold value is reduced.
10. A cold station system, characterized in that the cold station system comprises at least one cooling tower, at least one chiller, at least one frequency converter corresponding to the at least one cooling tower, and a controller according to any one of claims 1-5;
the controller is used for adjusting the frequency of each frequency converter in the at least one frequency converter;
the frequency converters are used for operating according to the frequency of the frequency converters so as to carry out frequency conversion control on the cooling towers corresponding to the frequency converters;
the at least one cooling tower is used for dissipating heat of the at least one water chilling unit.
11. The cold station system of claim 10, further comprising at least one cooling water pump;
the at least one cooling water pump is used for conveying cooling water generated by the at least one water chilling unit to the at least one cooling tower, so that the at least one cooling tower dissipates heat of the at least one water chilling unit.
12. An air conditioning system, characterized in that it comprises an air conditioner, at least one chilled water pump, and a cold station system according to any of claims 10-11;
the at least one chilled water pump is used for conveying chilled water generated by the at least one water chilling unit to the air conditioner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211618637.8A CN115978730A (en) | 2022-12-15 | 2022-12-15 | Controller for cold station system, and frequency conversion control method and system for cooling tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211618637.8A CN115978730A (en) | 2022-12-15 | 2022-12-15 | Controller for cold station system, and frequency conversion control method and system for cooling tower |
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